Engineering

Grip-Tite® Foundation Pier System

The Grip-Tite^® Foundation Pier System economically and safely stabilizes a building’s foundation, thereby minimizing additional, future settlement.

The Grip-Tite^® Foundation Pier System utilizes hydraulically driven steel columns and a rugged foundation bracket to transfer structural load to deep, dense soil or bedrock.

The end-bearing push pier system, suitable for both residential and commercial applications, installs quickly with small equipment and in areas of limited or tight access. When compared to other driven pile systems, the Grip-Tite system proves superior due to its ability to reach greater depths and load-bearing strata.

Advantages

• End-bearing pier that does not rely on friction for capacity
• Each pier load tested during installation
• Ability to reach greater depths using a starter tube with friction collar
• High-strength steel pier sections and sleeved couplings have high resistance to bending
• Long life span, resistance to corrosion (design life in moderate soils more than 100 years)
• Available with hot-dipped galvanized coating for added corrosion resistance

Specifications

Pier Tube

• 3.0-inch Outside Diameter (O.D.) x 0.120-inch wall tube steel, ultimate tensile strength = 80,000 psi (min.), yield tensile strength = 70,000 psi (min.)

Tube Reinforcing Insert

• 2.75-inch O.D. x 0.120-inch wall tube steel, ultimate tensile strength = 80,000 psi (min.), yield tensile strength = 70,000 psi (min.)

Foundation Bracket

• Bracket Tube
  3.875-inch O.D. x 3.125-inch Inside Diameter (I.D.) x 10-inch long DOM mechanical steel tubing conforming to ASTM 513 – Type 5 / Grade 1026. Ultimate tensile strength = 100,000 psi (min.), yield tensile strength = 90,000 psi (min.)
  
   
• Angle Bracket
  0.5-inch thick flat plate conforming to ASTM A-36 hot rolled steel bent to form a 90 degree angle with equal sides of approximately 8 inches. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)
  
   
• Bracket Support Strap
  0.375-inch thick x 3 inches wide x 21.25 inches flat bar conforming to ASTM A-36 hot rolled steel which is bent into a “horseshoe” shape around the bracket tube. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)
  
   
• Top Plate
  0.75-inch thick x 5.5 inches wide x 9.5 inches long conforming to ASTM A-36 hot rolled steel. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)
  
   
• Cap Plate
  1.0-inch thick x 4.0 inches wide x 8.5 inches long conforming to ASTM A-36 hot rolled steel. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)
  
   
• Weld
  E71T1, minimum tensile strength = 71,000 psi – peformed by AWS certified welder
  
   
• Threaded Rod
  0.75-inch diameter x 12 inches long ASTM A311 – Class B / Grade 8 Zinc Plated. Ultimate tensile strength = 150,000 psi, yield tensile strength = 130,000 psi
   

Capacity

• Foundation Pier System, which includes pier tube, tube reinforcing insert and foundation bracket, tested by an Independent Laboratory to peak loads exceeding 70,000 pounds (70 kips).

To learn more about the Wall Anchor System or other foundation repair products, click here to locate a Grip-Tite dealer near you.

See ICC-ES Legacy Report #22-03 prepared by the International Code Council